A late-night police chase and shootout has ended with one marathon bombing suspect being captured here, the Boston Globe reported. Meanwhile, an intense manhunt is underway for a second suspect in the terror case.

Federal agents swarmed neighboring Watertown after local police were involved in a car chase and shootout with at least two suspects. During the pursuit, officers could be heard on police radio traffic describing the suspects as having grenades and other explosives.

One reportedly escaped capture, and another was shot by police and taken to a local hospital. Another man was seen sprawled on the ground in footage shown on WHDH-TV.

The FBI has not confirmed a connection between the events in Watertown to the twin explosions that killed 3 people and injured 170 others at the Boston Marathon on Monday. But according to an alert sent issued to fellow officers, the suspect who remained at large was referred to as the “one with the white hat” seen in the photos released by the bureau on Thursday.

The suspect, described on scanner traffic as a “white male wearing a gray hooded sweatshirt with black curly hair, possibly with an assault rifle and explosives,” as police in Watertown, Newton, Brighton and Cambridge were put on high alert.

“We are aware of the law enforcement activity in the greater Boston area,” Boston FBI spokesman Greg Comcowich said in a statement. “The situation is ongoing. We are working with local authorities to determine what happened.”